| 摘要 |
<p>Various methods are described for reducing chromatic dispersion in planar optical waveguide device incorporating multi-mode waveguides. One method proposes choosing a shape of multi-mode waveguide for exciting at least one higher order mode above the fundamental mode, the shape being a function of at least one variable parameter; and optimizing one or more of the variable parameters so as to minimize chromatic dispersion in the device. The method can be used, for example, to optimize the shape of a multi-mode waveguide (6) provided in an AWG device (1), for flattening the output passband of the AWG. The variable parameter(s) can be, for example the length or width of one or more portions of the multi-mode waveguide. In one embodiment a phase-shifting waveguide (22) is disposed on one of a passband flattening multi-mode waveguide (20) in AWG and the length (L2) of the phase-shifting waveguide (22) is optimized to minimise chromatic dispersion.</p> |
